/* Basic Bangla-friendly, 3D-ish UI */
:root {
  --soft-shadow: 0 10px 25px rgba(0,0,0,.08);
  --radius: 1.25rem;
}

.card {
  border: 0;
  border-radius: var(--radius);
  box-shadow: var(--soft-shadow);
}

.btn-3d {
  border: none;
  border-radius: 1rem;
  box-shadow: 0 6px 0 rgba(0,0,0,.12);
  transition: transform .05s ease, box-shadow .2s ease;
}
.btn-3d:active {
  transform: translateY(2px);
  box-shadow: 0 3px 0 rgba(0,0,0,.2);
}

.module-grid .btn {
  min-height: 90px;
  font-weight: 600;
}

.badge-pill {
  padding: .5rem .75rem;
  border-radius: 10rem;
}

.table-rounded {
  border-radius: var(--radius);
  overflow: hidden;
}

/* Responsive buttons: 3 per row desktop, 2 per row mobile */
.module-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
@media (max-width: 768px) {
  .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Calculator */
.calculator {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .5rem;
}
.calculator .screen {
  grid-column: span 4;
  height: 60px;
  font-size: 1.25rem;
}